The term "muscle hypertrophy" specifically refers to the increase in the size of muscle fibers. This physiological process occurs when muscle fibers undergo stress, typically from resisting weight or performing strenuous activity, leading to adaptations that enhance their size and strength. Muscle hypertrophy is a goal commonly pursued by those engaged in resistance training, as it results in greater muscle mass and improved performance.
While muscle repair is indeed an important aspect of the recovery process that follows exercise, it is not synonymous with hypertrophy. Instead, hypertrophy occurs as a result of repeated cycles of stress and repair. The decrease in muscle fibers points to atrophy, which is the opposite effect, while defining muscle strength relates to the ability of a muscle to exert force, which can result from hypertrophy but is not the definition of the term itself.